I am on a VPS and i see cache problem too. I think my situation are explained well here.
If i log in with a test user, create post, delete it this still be visible if i change page and navigate sometimes.
Flarum core 0.1.0-beta.8
PHP version: 7.1.24
Loaded extensions: Core, date, libxml, pcre, dom, fileinfo, filter, hash, json, SPL, bz2, posix, Reflection, session, SimpleXML, standard, xml, xmlreader, xmlwriter, bcmath, openssl, calendar, ctype, curl, dba, mbstring, ftp, gd, gettext, gmp, iconv, imap, intl, ldap, exif, mcrypt, zlib, pcntl, PDO, pdo_sqlite, shmop, soap, sockets, sqlite3, sysvsem, sysvshm, tidy, tokenizer, wddx, xmlrpc, xsl, zip, Phar, mysqlnd, mysqli, pdo_mysql, ionCube Loader, Zend OPcache
+----------------------+-----------------+--------+
| Flarum Extensions | | |
+----------------------+-----------------+--------+
| ID | Version | Commit |
+----------------------+-----------------+--------+
| flarum-approval | v0.1.0-beta.8 | |
| flarum-bbcode | v0.1.0-beta.8 | |
| flarum-emoji | v0.1.0-beta.8 | |
| flarum-flags | v0.1.0-beta.8 | |
| flarum-likes | v0.1.0-beta.8 | |
| flarum-lock | v0.1.0-beta.8 | |
| flarum-markdown | v0.1.0-beta.8 | |
| flarum-mentions | v0.1.0-beta.8 | |
| flarum-sticky | v0.1.0-beta.8 | |
| flarum-subscriptions | v0.1.0-beta.8 | |
| flarum-suspend | v0.1.0-beta.8 | |
| flarum-tags | v0.1.0-beta.8.1 | |
| flarum-auth-github | v0.1.0-beta.8 | |
| flarum-auth-facebook | v0.1.0-beta.8 | |
| flarum-auth-twitter | v0.1.0-beta.8 | |
| flarum-lang-english | v0.1.0-beta.8 | |
| flagrow-upload | 0.7.0 | |
| flarum-statistics | v0.1.0-beta.8 | |
| flarum-pusher | v0.1.0-beta.8 | |
| nearata-lang-italian | v0.1.0-beta.8.1 | |
| fof-user-bio | 0.1.1 | |
+----------------------+-----------------+--------+
Debug mode off
I made a test: if i login to my community Beta 8 with an user account in incognito mode than logout i still see me login. I need refresh the page to see i have been logged out. This is not happening in the Flarum community if i do the same test. Issues are present also with post ... the login and incognito mode is just a quick easy test.
I do not use CloudFlare also if i have as nameserver i am not using their network.